Patents by Inventor Akimasa Kaizu
Akimasa Kaizu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11480477Abstract: A heat utilizing device is provided in which the thermal resistance of the wiring layer is increased while an increase in electric resistance of the wiring layer is limited. Heat utilizing device has thermistor whose electric resistance changes depending on temperature; and wiring layer that is connected to thermistor. A mean free path of phonons in wiring layer is smaller than a mean free path of phonons in an infinite medium that consists of a material of wiring layer.Type: GrantFiled: March 6, 2018Date of Patent: October 25, 2022Assignee: TDK CorporationInventors: Shinji Hara, Naoki Ohta, Susumu Aoki, Eiji Komura, Akimasa Kaizu
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Patent number: 11243118Abstract: An electromagnetic wave sensor that limits the influence on bolometer membranes that is caused by heat from a local heat source is provided. Electromagnetic wave sensor has first substrate, second substrate that faces first substrate so as to form inner space between first substrate and second substrate, wherein second substrate transmits infrared rays; a plurality of bolometer membranes that is provided in inner space and that is supported by second substrate; local heat source that is formed in first substrate; first electric connection member that connects first substrate to second substrate; and lead that extends on or in second substrate and that connects first electric connection member to bolometer membrane.Type: GrantFiled: March 7, 2018Date of Patent: February 8, 2022Assignee: TDK CorporationInventors: Naoki Ohta, Shinji Hara, Susumu Aoki, Eiji Komura, Akimasa Kaizu
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Patent number: 11165128Abstract: A high-frequency device includes a magnetoresistance effect element which includes a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer positioned between the first and second ferromagnetic layers, a soft magnetic material body which covers at least a part of a periphery of the magnetoresistance effect element from outside in a plan view in a lamination direction of the magnetoresistance effect element, a non-magnetic material body which is positioned between the soft magnetic material body and the first ferromagnetic layer in the plan view in the lamination direction, and a high-frequency line which is connected to or spaced apart from the magnetoresistance effect element. The high-frequency line is configured to input or output a high-frequency current to or from the magnetoresistance effect element, or is configured to apply a high-frequency magnetic field caused by a high-frequency current flowing through the inside to the magnetoresistance effect element.Type: GrantFiled: July 16, 2020Date of Patent: November 2, 2021Assignee: TDK CORPORATIONInventors: Naomichi Degawa, Shinji Hara, Akimasa Kaizu
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Patent number: 10984938Abstract: The magnetoresistance effect device includes: a magnetoresistance effect element that includes a first magnetization free layer, a magnetization fixed layer or a second magnetization free layer, and a spacer layer interposed between the first magnetization free layer and the magnetization fixed layer or the second magnetization free layer; and a magnetic material part that applies a magnetic field to the magnetoresistance effect element, wherein the magnetic material part is arranged to surround an outer circumference of the magnetoresistance effect element in a plan view in a stacking direction L of the magnetoresistance effect element.Type: GrantFiled: December 28, 2018Date of Patent: April 20, 2021Assignee: TDK CORPORATIONInventors: Shinji Hara, Akimasa Kaizu
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Publication number: 20210025765Abstract: A heat utilizing device is provided in which the thermal resistance of the wiring layer is increased while an increase in electric resistance of the wiring layer is limited. Heat utilizing device has thermistor whose electric resistance changes depending on temperature; and wiring layer that is connected to thermistor. A mean free path of phonons in wiring layer is smaller than a mean free path of phonons in an infinite medium that consists of a material of wiring layer.Type: ApplicationFiled: March 6, 2018Publication date: January 28, 2021Inventors: Shinji HARA, Naoki OHTA, Susumu AOKI, Eiji KOMURA, Akimasa KAIZU
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Publication number: 20200408604Abstract: An electromagnetic wave sensor that limits the influence on bolometer membranes that is caused by heat from a local heat source is provided. Eelectromagnetic wave sensor has first substrate, second substrate that faces first substrate so as to form inner space between first substrate and second substrate, wherein second substrate transmits infrared rays; a plurality of bolometer membranes that is provided in inner space and that is supported by second substrate; local heat source that is formed in first substrate; first electric connection member that connects first substrate to second substrate; and lead that extends on or in second substrate and that connects first electric connection member to bolometer membrane.Type: ApplicationFiled: March 7, 2018Publication date: December 31, 2020Inventors: Naoki OHTA, Shinji HARA, Susumu AOKI, Eiji KOMURA, Akimasa KAIZU
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Patent number: 10559412Abstract: At least one magnetoresistance effect element and a magnetic field applying unit to apply a magnetic field to the magnetoresistance effect element, the magnetic field applying unit includes a first ferromagnetic material having a portion protruding to the magnetoresistance effect element side in a stacking direction of the magnetoresistance effect element, a second ferromagnetic material sandwiching the magnetoresistance effect element with the first ferromagnetic material, and a coil wound around the first ferromagnetic material, a first magnetization free layer of the magnetoresistance effect element has a portion free of overlapping with at least one of a second surface of the protruding portion on the magnetoresistance effect element side and a third surface of the second ferromagnetic material on the magnetoresistance effect when viewed in the stacking direction, and a center of gravity of the first magnetization free layer, positioned in a region connecting the second surface and the third surface.Type: GrantFiled: November 29, 2018Date of Patent: February 11, 2020Assignee: TDK CORPORATIONInventors: Akimasa Kaizu, Naomichi Degawa, Tetsuya Roppongi
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Publication number: 20190228894Abstract: The magnetoresistance effect device includes: a magnetoresistance effect element that includes a first magnetization free layer, a magnetization fixed layer or a second magnetization free layer, and a spacer layer interposed between the first magnetization free layer and the magnetization fixed layer or the second magnetization free layer; and a magnetic material part that applies a magnetic field to the magnetoresistance effect element, wherein the magnetic material part is arranged to surround an outer circumference of the magnetoresistance effect element in a plan view in a stacking direction L of the magnetoresistance effect element.Type: ApplicationFiled: December 28, 2018Publication date: July 25, 2019Applicant: TDK CORPORATIONInventors: Shinji HARA, Akimasa KAIZU
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Publication number: 20190180901Abstract: At least one magnetoresistance effect element and a magnetic field applying unit to apply a magnetic field to the magnetoresistance effect element, the magnetic field applying unit includes a first ferromagnetic material having a portion protruding to the magnetoresistance effect element side in a stacking direction of the magnetoresistance effect element, a second ferromagnetic material sandwiching the magnetoresistance effect element with the first ferromagnetic material, and a coil wound around the first ferromagnetic material, a first magnetization free layer of the magnetoresistance effect element has a portion free of overlapping with at least one of a second surface of the protruding portion on the magnetoresistance effect element side and a third surface of the second ferromagnetic material on the magnetoresistance effect when viewed in the stacking direction, and a center of gravity of the first magnetization free layer, positioned in a region connecting the second surface and the third surface.Type: ApplicationFiled: November 29, 2018Publication date: June 13, 2019Applicant: TDK CORPORATIONInventors: Akimasa KAIZU, Naomichi DEGAWA, Tetsuya ROPPONGI
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Patent number: 9640205Abstract: A magnetic recording-reproducing head includes, on a support member, a first head section having a function of executing a recording process and having a function of executing a reproducing process, and one or more second head sections each having a function of executing an erasing process and having no function of executing a reproducing process.Type: GrantFiled: March 10, 2016Date of Patent: May 2, 2017Assignee: TDK CORPORATIONInventors: Akimasa Kaizu, Kei Hirata, Yosuke Antoku
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Patent number: 9299366Abstract: A magnetic recording and reproducing apparatus includes a magnetic recording medium including a recording layer in which at least two magnetic layers are layered on a non-magnetic substrate; and a magnetic head including a main magnetic pole for applying a recording magnetic field in a direction substantially perpendicular to a recording face of the magnetic recording medium and a microwave generating element that generates a microwave magnetic field. The relationship between a thickness Ts of a magnetic layer having a lowest magnetic anisotropy energy among the at least two magnetic layers composing the recording layer of the magnetic recording medium, and a thickness Tt of the recording layer is Ts/Tt?0.2. The microwave generating element applies the microwave magnetic field having a width broader than the width of the recording magnetic field generated by the main magnetic pole of the magnetic head to the magnetic recording medium.Type: GrantFiled: December 10, 2014Date of Patent: March 29, 2016Assignee: TDK CORPORATIONInventors: Tsutomu Aoyama, Akimasa Kaizu, Tetsuhito Shinohara, Yoshikazu Soeno
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Publication number: 20150170677Abstract: A magnetic recording and reproducing apparatus includes a magnetic recording medium including a recording layer in which at least two magnetic layers are layered on a non-magnetic substrate; and a magnetic head including a main magnetic pole for applying a recording magnetic field in a direction substantially perpendicular to a recording face of the magnetic recording medium and a microwave generating element that generates a microwave magnetic field. The relationship between a thickness Ts of a magnetic layer having a lowest magnetic anisotropy energy among the at least two magnetic layers composing the recording layer of the magnetic recording medium, and a thickness Tt of the recording layer is Ts/Tt?0.2. The microwave generating element applies the microwave magnetic field having a width broader than the width of the recording magnetic field generated by the main magnetic pole of the magnetic head to the magnetic recording medium.Type: ApplicationFiled: December 10, 2014Publication date: June 18, 2015Inventors: Tsutomu AOYAMA, Akimasa KAIZU, Tetsuhito SHINOHARA, Yoshikazu SOENO
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Patent number: 8611034Abstract: A magnetic recording device includes a magnetic disk and a magnetic head that performs magnetic recording to the magnetic disk. The magnetic head includes a main magnetic pole layer and a microwave generating element. The magnetic recording device further includes a microwave generating element driving current control circuit. The microwave generating element driving current control circuit, during the magnetic recording, applies a microwave generating element driving current at a first current level to the microwave generating element for a period that is from at the latest a polarity reversal of the recording current before a subsequent polarity reversal of the recording voltage, and thereafter applies another microwave generating element driving current at a second current level, which is smaller than the first current level, to the microwave generating element, or stops the application of the another microwave generating element driving current until the polarity reversal of the recording voltage.Type: GrantFiled: March 30, 2012Date of Patent: December 17, 2013Assignee: TDK CorporationInventors: Tatsuhiro Kobayashi, Yoshikazu Soeno, Akimasa Kaizu
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Patent number: 8611045Abstract: A magnetic recording apparatus includes a magnetic recording medium that is provided with a first magnetic layer with magneto crystalline anisotropy energy, a second magnetic layer with magneto crystalline anisotropy energy that is smaller than the magneto crystalline anisotropy energy of the first magnetic layer, and a nonmagnetic metal layer that is positioned between the first magnetic layer and the second magnetic layer and that provides coupling force between the first magnetic layer and the second magnetic layer; and a magnetic head that includes a main pole that applies a recording magnetic field in a direction perpendicular to a film surface of the magnetic recording medium to the magnetic recording medium, and an alternate current (AC) magnetic field generator that applies an AC magnetic field with a frequency of 1-40 GHz to the magnetic recording medium.Type: GrantFiled: September 29, 2011Date of Patent: December 17, 2013Assignee: TDK CorporationInventors: Akimasa Kaizu, Tsutomu Aoyama, Yoshikazu Soeno
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Publication number: 20130258514Abstract: A magnetic recording device includes a magnetic disk and a magnetic head that performs magnetic recording to the magnetic disk. The magnetic head includes a main magnetic pole layer and a microwave generating element. The magnetic recording device further includes a microwave generating element driving current control circuit. The microwave generating element driving current control circuit, during the magnetic recording, applies a microwave generating element driving current at a first current level to the microwave generating element for a period that is from at the latest a polarity reversal of the recording current before a subsequent polarity reversal of the recording voltage, and thereafter applies another microwave generating element driving current at a second current level, which is smaller than the first current level, to the microwave generating element, or stops the application of the another microwave generating element driving current until the polarity reversal of the recording voltage.Type: ApplicationFiled: March 30, 2012Publication date: October 3, 2013Applicant: TDK CorporationInventors: Tatsuhiro KOBAYASHI, Yoshikazu Soeno, Akimasa Kaizu
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Publication number: 20130242430Abstract: Ion irradiation is applied to the surface of a recording layer which has a granular structure containing ferromagnetic particles which are composed of an L10 ordered alloy and a non-magnetic intergranular layer, thereby the ferromagnetic particles in the side of the substrate are transformed into an L10 ordered alloy having a high magnetic anisotropy, and the ferromagnetic particles in the side of the surface of the medium are transformed into an A1 disordered alloy having a low magnetic anisotropy.Type: ApplicationFiled: March 8, 2013Publication date: September 19, 2013Applicant: TDK CORPORATIONInventors: Tsutomu AOYAMA, Yoshikazu SOENO, Akimasa KAIZU
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Patent number: 8456962Abstract: A magnetic head that writes information to a recording medium includes a magnetic pole layer that generates a writing magnetic field to the recording medium, a microstripline that is disposed in proximity to the magnetic pole layer and to which high frequency current is applied, and a ferromagnetic thin film that is disposed on a portion of the microstripline that faces the recording medium, and that generates a high frequency alternate-current (AC) magnetic field to be applied to the recording medium, using a current magnetic field generated on the microstripline due to the high frequency current.Type: GrantFiled: March 31, 2011Date of Patent: June 4, 2013Assignee: TDK CorporationInventors: Takekazu Yamane, Yoshikazu Soeno, Akimasa Kaizu, Naomichi Degawa, Hayato Koike
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Publication number: 20130083428Abstract: A magnetic recording apparatus includes a magnetic recording medium that is provided with a first magnetic layer with magneto crystalline anisotropy energy, a second magnetic layer with magneto crystalline anisotropy energy that is smaller than the magneto crystalline anisotropy energy of the first magnetic layer, and a nonmagnetic metal layer that is positioned between the first magnetic layer and the second magnetic layer and that provides coupling force between the first magnetic layer and the second magnetic layer; and a magnetic head that includes a main pole that applies a recording magnetic field in a direction perpendicular to a film surface of the magnetic recording medium to the magnetic recording medium, and an alternate current (AC) magnetic field generator that applies an AC magnetic field with a frequency of 1-40 GHz to the magnetic recording medium.Type: ApplicationFiled: September 29, 2011Publication date: April 4, 2013Applicant: TDK CorporationInventors: Akimasa Kaizu, Tsutomu Aoyama, Yoshikazu Soeno
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Publication number: 20120250472Abstract: A magnetic head that writes information to a recording medium includes a magnetic pole layer that generates a writing magnetic field to the recording medium, a microstripline that is disposed in proximity to the magnetic pole layer and to which high frequency current is applied, and a ferromagnetic thin film that is disposed on a portion of the microstripline that faces the recording medium, and that generates a high frequency alternate-current (AC) magnetic field to be applied to the recording medium, using a current magnetic field generated on the microstripline due to the high frequency current.Type: ApplicationFiled: March 31, 2011Publication date: October 4, 2012Applicant: TDK CorporationInventors: Takekazu YAMANE, Yoshikazu Soeno, Akimasa Kaizu, Naomichi Degawa, Hayato Koike
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Patent number: 8040633Abstract: A magnetic recording-reproducing apparatus includes: a magnetic recording medium in which portions corresponding to track portions serve as recording areas and in which portions between the recording areas serve as non-recording areas; and a magnetic head having a main pole and a side shield disposed on both sides of the main pole in a cross-track direction. In the magnetic recording-reproducing apparatus, following inequality (I) is satisfied: S>Tw/2+Gw??(I) where Tw is a track width, Gw is a gap width, and S is a distance between the center of the main pole of the magnetic head and an edge on the main pole side of each of the side shields.Type: GrantFiled: December 11, 2007Date of Patent: October 18, 2011Assignee: TDK CorporationInventors: Akimasa Kaizu, Yoshikazu Soeno, Kazuya Shimakawa